Seat apparatus, modular seat and rotation mechanism

A seat apparatus comprising:

• a base:
• a seat, wherein the seat is moveably connected to the base such that the seat is rotatable relative to the base;
• a rotation mechanism, comprising:
• a first locking assembly associated with the seat, the first locking assembly configured to lock the seat in one or more positions relative to the base, wherein the first locking assembly comprises a trigger that is manually actuable by a user;
• a locking plate attached to the base, where the locking plate comprises a plurality of apertures:
• a swivel plate rotatable relative to the locking plate;
• and
• a bearing positioned between the locking plate and the swivel plate,
• the bearing rotatably coupling the swivel plate to the locking plate such that seat can rotated relative to the base;
• and
• a first armrest located at radial opposing locations of the seat, wherein the first armrest comprises a support member and a vertical strut connected to and holds up the support member, the vertical strut is coupled to the swivel plate, and the trigger is positioned on or within the first armrest,
• wherein the trigger is mounted within a housing of the support member, and the first locking assembly is extended through a hollow tube of the vertical strut,
• wherein the seat is rotatable between an operative position and one or more other rotated positions, and the seat being lockable at the operative position and the one or more rotated positions by the locking assembly,
• wherein the seat is unlocked when the trigger is actuated, to allow the seat to rotate relative to the base.